Hello Peter

Sulfate is H2SO4 in this case since sulfuric acid gas phase immediately condense and dissociate.

However, be aware that you only have the gas phase sulfate production here, it misses aqueous chemistry. In the regcm-core development version , simple aqueous chemistry used in AERO simulation is also active in DCCB. Unfortunatly  this is not backported to regcm4.6 yet ( but should be )

Fabien

Dear RegCM  users,

i have a question regarding the DCCB chemistry option in the 4.6.0 version:

The user guide days (Page 35): 

"DCCB : Activate CBMZ +DUST +CARB + sulfate-nitrate-ammonium aerosol calculated with the

ISORROPIA gas-aerosol thermodynamical scheme: 50 tracers are considered here."

When I look at the code in mod_che_common, I find:

ntr = 50

which is ok, but when looking at the species list, I cannot find sulfates  (like ANO3 and ANH4 that stands for nitrates and ammonium).

chtrname(1:ntr)(1:6) = (/'NO    ','NO2   ','N2O5  ','HNO2  ',&
                              'HNO3  ','HNO4  ','O3    ','H2O2  ',&
                              'CO    ','SO2   ','DMS   ','H2SO4 ',&
                              'CH4   ','C2H6  ','PAR   ','CH3OH ',&
                              'HCHO  ','ALD2  ','AONE  ','ETH   ',&
                              'OLET  ','OLEI  ','TOL   ','XYL   ',&
                              'ISOP  ','ONIT  ','PAN   ','HCOOH ',&
                              'RCOOH ','CH3OOH','ETHOOH','ROOH  ',&
                              'MGLY  ','ISOPRD','ISOPN ','OPEN  ',&
                              'CRES  ','NH3   ','DUST01','DUST02',&
                              'DUST03','DUST04','BC_HL ','BC_HB ',&
                              'OC_HL ','OC_HB ','SSLT01','SSLT02',&
                              'ANO3  ','ANH4  ' /)

Can somebody explain me, why it is so? 

Thanks a lot in advance

With regards,

Peter